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Bulan was a Khazar king who led the conversion of the Khazars to Judaism. His name means "elk" in Old Turkic. In modern Turkish, it means The one who finds (Bul + an). The date of his reign is unknown, as the date of the conversion is hotly disputed, though it is certain that Bulan reigned some time between the mid-700s and the mid-800s. Nor is it settled whether Bulan was the Bek or the Khagan of the Khazars.
D. M. Dunlop was certain that Bulan was a Khagan; however, more recent works, such as The Jews of Khazaria by Kevin Brook, assume that he was the Bek due to references to him leading military campaigns. Khazar tradition held that before his own conversion, Bulan was religiously unaffiliated. In his quest to discover which of the three Abrahamic religions would shape his own religious beliefs, he invited representatives from each to explain their fundamental tenets. In the end, he chose Judaism.
In the Khazar Correspondence, King Joseph traces his lineage back to Bulan. He refers to the reforming Khazar ruler Obadiah as being one of "the sons of the sons of Bulan". While Brook assumes this makes Obadiah Bulan's grandson, the Hebrew phrase is less definitive and may allude to a more remote descent. The royal descendants of Bulan are referred to by Khazar researchers as Bulanids, though their self-designation is unknown.
The name Sabriel is given in the Schechter Letter (roughly contemporaneous with King Joseph's letter) for the Khazar king who led the conversion to Judaism. The Schechter Letter also gives Sabriel at least a partial Jewish/Israelite ancestry. Sabriel is described as having waged successful campaigns in the Caucasus and Iranian Azerbaijan, possibly as part of the Khazar-Arab wars.
His wife, Serakh, is described as a Jew and as encouraging him to study and adopt Judaism. The Schechter Letter is silent on the issue of whether Sabriel was in fact Bulan; in fact, the name Bulan does not appear in that document.
Khazar scholars sometimes refer to the king who led the Khazar conversion to Judaism as "Bulan Sabriel", though it is conceivable that they may have been different people. In The History of the Jewish Khazars, for instance, D. M. Dunlop examined (and ultimately rejected) the theory of other scholars that Sabriel in fact referred to Obadiah.
- Kevin Alan Brook. The Jews of Khazaria. 2nd ed. Rowman & Littlefield Publishers, Inc, 2006.
- Douglas M. Dunlop, The History of the Jewish Khazars, Princeton, N.J.: Princeton University Press, 1954.
- Norman Golb and Omeljan Pritsak, Khazarian Hebrew Documents of the Tenth Century. Ithaca: Cornell Univ. Press, 1982.